1 files changed, 96 insertions, 0 deletions
diff --git a/sandbox-rlimit.c b/sandbox-rlimit.c
new file mode 100644
index 0000000..26c61d2
--- /dev/null
+++ b/sandbox-rlimit.c
@@ -0,0 +1,96 @@
+/* $OpenBSD: sandbox-rlimit.c,v 1.5 2020/10/18 11:32:01 djm Exp $ */
+/*
+ * Copyright (c) 2011 Damien Miller <djm@mindrot.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "includes.h"
+
+#ifdef SANDBOX_RLIMIT
+
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "log.h"
+#include "ssh-sandbox.h"
+#include "xmalloc.h"
+
+/* Minimal sandbox that sets zero nfiles, nprocs and filesize rlimits */
+
+struct ssh_sandbox {
+	pid_t child_pid;
+};
+
+struct ssh_sandbox *
+ssh_sandbox_init(struct monitor *monitor)
+{
+	struct ssh_sandbox *box;
+
+	/*
+	 * Strictly, we don't need to maintain any state here but we need
+	 * to return non-NULL to satisfy the API.
+	 */
+	debug3_f("preparing rlimit sandbox");
+	box = xcalloc(1, sizeof(*box));
+	box->child_pid = 0;
+
+	return box;
+}
+
+void
+ssh_sandbox_child(struct ssh_sandbox *box)
+{
+	struct rlimit rl_zero;
+
+	rl_zero.rlim_cur = rl_zero.rlim_max = 0;
+
+#ifndef SANDBOX_SKIP_RLIMIT_FSIZE
+	if (setrlimit(RLIMIT_FSIZE, &rl_zero) == -1)
+		fatal_f("setrlimit(RLIMIT_FSIZE, { 0, 0 }): %s",
+			strerror(errno));
+#endif
+#ifndef SANDBOX_SKIP_RLIMIT_NOFILE
+	if (setrlimit(RLIMIT_NOFILE, &rl_zero) == -1)
+		fatal_f("setrlimit(RLIMIT_NOFILE, { 0, 0 }): %s",
+			strerror(errno));
+#endif
+#ifdef HAVE_RLIMIT_NPROC
+	if (setrlimit(RLIMIT_NPROC, &rl_zero) == -1)
+		fatal_f("setrlimit(RLIMIT_NPROC, { 0, 0 }): %s",
+			strerror(errno));
+#endif
+}
+
+void
+ssh_sandbox_parent_finish(struct ssh_sandbox *box)
+{
+	free(box);
+	debug3_f("finished");
+}
+
+void
+ssh_sandbox_parent_preauth(struct ssh_sandbox *box, pid_t child_pid)
+{
+	box->child_pid = child_pid;
+}
+
+#endif /* SANDBOX_RLIMIT */